Thank you very much for the detailed explanation. So, it seems to be, if I need Unfold3D, than I must direct use data from MOI3D. There is one problem: some times Unfold3D tell me, that something is wrong with the mesh and than, in the past, I tried to fix the mesh error in Rhino. If I get an error again I will post it - if I remember me right, the error was called a "butterfly point".

At the Unfold3D help page I found some infos about the mesh requirements. Is it possible to get meshes without butterfly points per MoI?

http://www.polygonal-design.fr/e_unfold/manual3_1v5.php